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During summer season,a child was walking...

During summer season,a child was walking through a garden where he saw a mango on the tree at a height of 20m ,he decides to throw a stone and break it from the tree so he picks up a stone and throws it vertically upwards the mango .The stone hits the mango after exactly 2s seconds ,then the speed withnwhich the stone was thrown upwards (take g=10m/x2)

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